Drilling jig scale and clamp



Jah. 16, 1945. J, HoNYoUsr DRILLING JIG SCALE AND CLAMP Filed Jan. 26, 1942 Patented Jan. 16, 1945 UNITED STATES PATENT OFFICE DRILLING JIG SCALE AND CLAMP John Honyoust, Alexandria, Va.

Application January 26, 1942, Serial No. 428,313

5 Claims.

This invention relates to drilling jigs.

An object of this invention is to provide a jig for mounting on a face of the work to guide a plurality of drills.

Another object of this invention is to provide a jig of this kind wherein the drill guides are adjustably mounted on a combined guide bar and carrier and which includes an extensible carrier with means for detachably coupling the latter to the main carrier.

A further object of this invention is to provide a jig for mounting on a face of the work and an improved clamping means for holding the jig in position, the clamping means being so constructed as not to injure or mar the work.

To the foregoing objects and others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will be more specically referred to and illustrated in the accompanying drawing, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawing:

Figure 1 is a detail top plan partly broken away and in section of a drilling jig constructed according to an embodiment of this invention,

Figure 2 is a longitudinal section taken on the line 2-2 of Figure 1,

Figure 3 is a sectional View taken on the line 3 3 of Figure 1,

Figure 4 is a sectional View taken on the line 4-4 of Figure 1,

Figure 5 is a detail side elevation of one of the drilled guides, and

Figure 6 is a detail top plan of one of the gauge pointers associated with a drill guide.

Referring to the drawing the numeral I designates generally an elongated longitudinally slotted carrier or guide which is adapted to be mounted on the upper surface Il of a piece of work I2. The carrier or guide IIJ as shown in Figure 4 is formed of a pair of spaced apart parallel bars I3 and I4 which are integrally connected together at their opposite ends by top plates I and I6. 'I'he elongated bar I3 at its upper inner edge is provided with an inwardly projecting flange Il and the elongated bar I4 at its upper edge is provided with an inwardly projecting flange I8. The two confronting flanges Il and I8 form an elongated slot I9 therebetween, `the purpose for which will be hereinafter described.

A block is secured between the two bars I3 and I4 adjacent one end thereof, being secured therebetween by fastening devices 2l in the form 55 -flanges Il and I8.

of counter-sunk set screws or the like. The block or body 20 at its inner end is formed with a V- shaped pointer or gauge member 22, the apex of which is disposed centrally between the two The two bars or channel forming members I3 and I4 also have secured therebetween adjacent the opposite ends thereof a second block 23 which is formed at the inner end thereof with a V-shaped pointer 24 confronting the pointer 22. The apex of the pointer 24 is disposed centrally of the space between the two anges II and I8, so that the two pointers 22 and 24 will define the exact center of the elongated slot I9 and in practice may be positioned over a scratch or other line which may be formed on the upper surface of the work-piece I2. The block 23 is secured between the two bars or elongated members I3 and I4 by means of fastening devices 25 in the form of counter-sunk set screws or the like.

An upstanding drill guiding member generally designated as 26 extends upwardly from the carrier I0 and includes an upstanding annular body 2l which is formed adjacent the upper end thereof with a pair of diametrically opposed parallel fiat faces 28. The body 21 is formed centrally thereof with a vertically disposed drill guiding bore 29 which at its upper end is outwardly flared as at 30, so as to facilitate the insertion of a drill in the upper open end of the bore 29. The body 2I at the lower end thereof is formed with a reduced shank or stud 3| having a threaded lower end portion 32. The stud or reduced portion 3| is adapted to slidingly engage between the confronting edges of the two iianges I'I and I8. The drill guiding bore 29 extends entirely through the stud 3I and the threaded portion 32, so that a drill inserted in the bore 29 may engage the upper surface of the workpiece I2.

A nut member 33 is slidingly disposed between the confronting inner sides of the two elongated bars I3 and I4 and slidingly engages the under sides of the two flanges I'I and I8. The threaded portion 32 of the stud 3I is threaded into the nut 33, so that tightening of the stud portion 32 in the nut 33 will tightly hold the guide member 2E against movement lengthwise of the slot I9. The nut member 33 is provided with at least two opposed flat faces confronting the inner sides of the elongated bars or members I3, so that the nut 33 will thereby be held against rotary movement while having sliding movement lengthwise of the slot I9 when the guide member 26 is loosenec. relative to the nut 33.

In order to provide a means whereby the guide `rier I by removable fastening devices 25a.

member 26 may be adjusted lengthwise for a predetermined distance with respect to the slot I9, the upper outer edges of the guide members or bars I2 and I4 are formed with graduations 34 and respectively. A double ended pointer 36 is disposed on the upper sides of the flanges I1 and I8 and the elongated members I3 and I4, and is formed with an annular central body 31 constituting a washer against which the lower end of the body 21 is adapted to engage. I'he pointer 36 is held against rotary movement while permitting sliding movement with respect to the slot I9 by means of a square or polygonal guide 38, which is adapted to extend downwardly between the confronting edges of the flanges I 1 and I8. The depth of the guide 38 is substantially less than the thickness of the flanges I1 and I8, so that when the nut 33 is tightened, the upper side of the nut 33 will not contact with the lower side of the guide member 38.

As will be noted from the drawing there are` disclosed at least two drill guide members designated 26 and 2lia which are of like construction and which may be adjusted one independently of the other, so that two drills may be guided toward the workpiece l2.

The carrier I0 is held against endwise movement in one direction with respect to the workpiece I2 by means of an elongated tapered pin 39 which removably engages in aligned tapered openings 40 and 4I which are formed in the connecting plate I5 and the block 20 respectively. The lower or depending portion 42 of the pin 39 is adapted to engage against an adjacent edge or side of the workpiece I2 with the carrier I0 rest- I;

ing flat upon the upper flat side of the workpiece I2,

An extensible carrier or guide member generally designated as IIlat is adapted to be removably secured to the inner end portion of the car- The carrier is constructed similar in every detail to the carrier I0 with the exception that the inner end portion of the carrier Illl1 is adapted to telescope over the projecting end portion of the block 23. The block 23 is formed with a second gauge point 43, the apex of which is adapted to project inwardly into the adjacent end of the slot I 9* formed between the side bars I3El and I4. A pair of drill guiding members 2lib and 2lic which are similar in every detail to the drill guiding member 26 are adapted to be adjustably secured along the length of the slot I9. The inner end portion of the extensible carrier I0 is also provided with a block 23a similar to the block 23 which has an inwardly projecting point 24 confronting the point 43, and also has an outer point 43u which may be positioned within the slot of a further extension similar to the extension |08. The block 23a is secured within the channel formed by the side members I3 and I4*l by fastening devices 44 or the like.

In order to provide a means whereby the carrier I0 or any extension secured thereto may be firmly held on the upper side of the workpiece I2. I have provided a releasable clamp or holding member generally designated as 45. The clamping or holding member 45 includes a pair of electro-magnetic members 46 and 41 which are adapted to be disposed on opposite sides of the carrier I0. The electro-magnetic members 46 and 41 are adapted to be connected by means of conductors 48 and 49 respectively to a suitable source of electric current supply, so that when the electro-magnetic members 46 and 41 are energized they will be magnetically held against shifting with respect to the workpiece I2 which may be formed of iron, steel, or other similar metal. The two electro-magnestic members 4l and 41 are connected together by means of a connecting bar 50 which constitutes a bridge piece and a pressure bag. The bridge piece 5I at a point between the two electro-magnetic members 46 and 41 has threadably extended thereto a pair of clamping screws 5I and 62. The screw 5I has a wing head 53 at its upper end and the screw 52 has a wing head 54 at its upper end. The lower ends of the screws 5I and 52 are adapted to engage the upper sides of the bars I3 and I4, so as to rmly clamp these bars on the upper side of the workpiece I2.

In the use and operation of this jig the pin 36 is extended through the aligned openings 40 and 4I of the carrier I0 including the block 20, and the projecting lower end portion 42 of the pin 33 is then engaged with one edge of the workpiece I2. The carrier In is positioned on the flat upper side of the workpiece I2 and extends inwardly from the edge 55 of the workpiece I2. The two pointers 22 and 24 are then aligned with g scratch mark 56 which may be formed cn the upper side II of the piece of work I2. The line 56 will then be positioned in intersecting relation with respect to the axial centers of the guide members 26 and 26a. In the event it is desired to drill a hole in the workpiece I2, as for an example two inches from the outer edge 55 on the line 56, the first or outer guide member 26 is adjusted to the proper graduations on the upper side of the carrier I0 and then tightened in its adjusted position,

If a second hole is to be drilled in the workpiece I2, the second guide member 26 may be adjusted to the desired position lengthwise of the carrier I0 along the line 56. The drilling machine may then be lowered, so that the drills will enter the drill guide bores of the guide members 26 and 26a. The carrier I0 may be firmly held in its adjusted position with respect to the work I2 by mounting the clamping member 45 in a straddling position with respect to the carrier I 0 as shown in Figures l and 3.

The electro-magnetic members 46 and 41 may then be connected to a source of electric current supply, so as to energize these members and ilrmly hold these members against movement on the upper side II of the work I2. The clamping screws 5I and 52 may then be threaded downwardly, so as to tightly press on the upper sides of the elongated bars I3 and I4 arid firmly hold the carrier I0 against endwise or lateral shifting with respect to the workpiece I2.

The jig hereinbefore described may be made out of any suitable metal such as steel, aluminum, or the like, and if desired, maybe made by stamping, machining o1' other suitable means which will provide an accurate jig for guiding drills during a drilling operation or other kindred pur- DOSBS.

What I claim is:

1. A drilling jig comprising an elongated longitudinally slotted member, a pair of confronting pc-inter members xedly carried by said member one at each end'of the slot, a pin engaging through an end of said member and extending above and below the latter, an upstanding drill guide provided with an axial bore, a reduced diameter stud carried by said guide, and a nut threaded onto said stud and slidably engaging said member said guide being adjustable length- Wise oi said slotted member and the vertical axis of said guide intersecting a line drawn between said pointer members.

2. A drilling jig comprising an elongated longitudinally slotted member, graduations cairied by said Amember on the upper side thereof, a pair of confronting pointer members carried by said member one at each end of the slot` a pin engaging through an end of said member' and extending above and below the latter, an upstanding drill guide provide-d with an axial bore, a pointer interposed between the lower end of said guide and the upper side oi said member, a reduced diameter stud carried by said guide, and a nut threaded onto said stud and slidably engaging said member.

3. A drilling jig comprising in combination an elongated longitudinally slotted member,means at one end of said member engagcable with an edge of the work for holding said member against endwise movement in one direction, and electro-magg netic means engageable with said member and the work for holding the member tightly onto the work. said electro-magnetic means including a pressure bar engageable over said member, a pair of spaced apart electro-magnet members carried by said bar, and threaded pressure elements carried by said bar engageable with said rst member.

4. A drilling jig comprising in combination an CII elongated longitudinally slotted carrier, means at one end of said carrier engageable with the work for holding the carrier against movement in one direction, a pair of opposed pointers fixed to said carrier, an outwardly extending pointer integral with one of said pair of pointers, a second carrier provided with a channel in one end thereof within which said outwardly extending pointer is engageable, means detachably securing said second carrier on said latter pointers, an upstanding drill guide for each carrier, and means holding each guide in adjusted position relative to.a carrier.

5. A drilling jig comprising in combination an elongated longitudinally slotted carrier, means at one end of sai-d carrier engageabie with the work for holding the carrier against movement in one direction, a pair of opposed pointers xed to saidl carrier, an outwardly extending pointer integral with one of said pair of pointers, a second carrier provided with a channel in one end thereof within which said outwardly extending pointer is engageab'le, means detachably securing said second carrier on said latter pointer, an upstanding drill guide for each carrier, means holding each guide in adjusted position relative to a carrier, and means engageable over one oi said carriers and with a face of the work for holding said carriers against lateral shifting.

JOHN HONYOUST, 

